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WRRCTMR No.56 Rotating Disc Sewage Treatment Systems for Suburban Developments and High-Density Resorts of Hawai'i
|Title:||WRRCTMR No.56 Rotating Disc Sewage Treatment Systems for Suburban Developments and High-Density Resorts of Hawai'i|
|Authors:||Griffith, Garry T.|
Young, Reginald H.F.
Chun, Michael J.
|LC Subject Headings:||Honolulu (Hawaii)|
Sewage -- Purification -- Hawaii -- Oahu.
Sewage -- Purification -- Rotating disc process.
|Issue Date:||Jan 1978|
|Publisher:||Water Resources Research Center, University of Hawaii at Manoa|
|Citation:||Griffith GT, Young RHF, Chun MJ. 1978. Rotating disc sewage treatment systems for suburban developments and high-density resorts of Hawai'i. Honolulu (HI): Water Resources Research Center, University of Hawaii at Manoa. WRRC technical memorandum report, 56.|
|Series/Report no.:||WRRC Technical Memorandum Report|
|Abstract:||Present experience with extended aeration plants in high density resort and suburban developments in Hawai'i has been generally unsatisfactory due to (1) inadequate system management resulting from insufficient
manpower resources, and (2) high energy input required for aeration. A large scale pilot rotating disc unit was developed and field tested as a practical alternative to such extended aeration systems.
A literature review on rotating disc systems provided information on the basic theory of operation, pilot plant sizing and configuration, pilot system operation and data-gathering techniques, and hydraulic and
organic loading rates. Laboratory operation of a bench-scale (6-in. diameter discs) unit led to the conclusion that movement of solids within the unit would be a major problem.
A large-scale pilot unit (2-ft diameter discs) was designed and fabricated to remove 85% BOD from 1000 gpd raw domestic sewage. The unit provides for primary settling, four-stage bio-disc biological treatment, final clarification and capacity for 50-day sludge storage and anaerobic digestion. The pilot unit has been installed and operated at the
City and County of Honolulu's Pacific Palisades Wastewater Treatment Plant.
Results from loading rates of 2.2 and 4.0 gpd/ft^2 are encouraging with 80-90% BOD and better than 90% SS removed. Further evaluation of the data as well as performance studies at other loading rates are continuing.
|Sponsor:||U.S. Department of the Interior and the Water Resources Research Center, University of Hawaii OWRT Project No. A-068-HI, Grant Agreement No. 14-34-0001-7025|
|Pages/Duration:||v + 14 pages|
|Appears in Collections:||WRRC Technical Memorandum Reports|
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